How should I apply THE DOCTOR Panthenol and Apple Vinegar Hair Serum? — The Doctor. Hair Serum with Panthenol and Apple Vinegar Reconstruction, 89 ml

This is a leave-in serum, which means you apply it to the hair and leave it in instead of rinsing it out. The most practical time to use it is right after washing, while your hair is still damp. Start with a modest amount — about the size of a hazelnut or a small coin — and add more only if your hair still feels dry. Rub your palms together first, then spread the serum over the mid-lengths and ends, where hair tends to be roughest. If your scalp feels tight or flaky, you can press the remaining product onto the scalp with your fingertips, but there is no need to use a large amount there; this formula is light, so it spreads well even in a thin layer. After applying, comb through with a wide-tooth comb to distribute the serum evenly and avoid leaving any section dry or over-saturated. You can then style as usual. A very small drop on dry hair can also help tame flyaways, though the product is intended mainly for use on damp hair. Because it is water-based, it absorbs quickly and does not leave a heavy film when used in normal amounts. Still, start with less rather than more: you can always add another thin layer, but removing excess usually requires another wash. Avoid contact with the eyes. If your scalp is very sensitive or has broken skin, test the serum on a small area first and stop using it if irritation develops.